put a lighter spring in it then trying fill your gun to 150 bar shoot it till it gets to 100 bar then refill your gun
you will get better conistansy
fn19/12 start hit the sweet spot at 150 bar and highest at about 130bar
set your power to 11.5 at around 130/140 bar you will get about 60 shots in 22 at about 15fps spread
but with heavier spring or if you have power right up power and speed will go down with every shot
worth a try bud had lots of falcons great guns hope it helps